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Its difficult to explain, at first I thought she had a hairball but it sounds like wheezing with a congested chest infection, she kinda coughs but brings nothing up, her breathing almost sounds like purring but its not its because shes congested @nikv

Does she put her head low to the ground when she coughs? Have you gone as far as X-rays?
I have a cat that was born feral and lived outside until she was given to me at 4 months of age. She tamed herself and also had a bad cough. The vet said she was too young for asthma but I had her spayed when she was 7 months old and xrayed then. The xrays weren't of an asthmatic but showed little white patches in the lungs. My vet put her on antibiotics for one month, along with low-dose steroids, which we discontinued after a month. She stopped after that. The problem with feral cats is that they get exposed to all kinds of things

Strangely she does not lower her head to the ground and no xrays I basically dont have the funds for it right now but have been collecting what I can from Steemit for her, and I agree the poor things can get all sorts I wrote another post with more details on it here if interested https://steemit.com/cats/@simonjay/cat-respiratory-bad-health-signs-18-6-2018